Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 355

② Prior study before installation (Usage limitation)
(1) Temperature conditions for OA spacer
・ Adjust the temperature conditions of mixed air with outdoor air and indoor air
within the usage range of suction air temperature for the air-conditioner.
・ The usage temperature conditions of intake outdoor air and indoor air around the
ducts are shown in the following table.
・ If the temperature conditions of intake outdoor air do not meet, process the
outdoor air before intaking.
Operation mode
Intake outdoor air
In heating 5ºC DB or higher
29ºC DB or lower and
In cooling
80% RH or lower
(2) Intake outdoor air volume
・Intake outdoor air volume is 2.6 m /min at the maximum (when two sets of duct joints are used).
3
Up to two sets of duct joint can be installed on OA spacer.
In case one set of duct joint is installed: 1.3 m
In case two sets of duct joint is installed: 2.6 m
(3) Selection of booster fan
・Select the booster fan based on the duct resistance plus the pressure loss at the duct joint.
(See the figure)
(4) Other conditions
・Determine the capacity of air-conditioner based on the calculation of air-conditioner load including the heat
load of intake outdoor air.
・Install the filter for the intake outdoor air and the reverse flow prevention dumper during the duct work at
site.
・Insulate the duct and duct joint in order to prevent dewing.
・Interlock the operation of booster fan with ON/OFF operation of the indoor unit. (See Section 7.)
Indoor unit
(FDTC)
OA Spacer
Duct
(TC-OAS-E)
Panel
Indoor
③ Installation of duct joint (TC-OAD-E) onto OA spacer
・ There are two places where the duct joint can be installed.
When installing one duct joint
Install OA spacer at either one of two installation places on the duct joint.
Duct joint
When installing two duct joints
Duct joint
Usage temperature conditions
Indoor air around the ducts
18.5ºC WB or lower and
60% RH or lower
20ºC DB or higher
/min max.
3
/min max.
3
Provided at site
Filter
Booster fan
OA
Duct joint Dumper
(TC-OAD-E)
Outdoor
Spacer
To install the duct joint,
screw it in as shown at left.
Lid
Screw
Spacer
Remove the lid and then install two pieces of duct joint.
Lid
Screw
Duct joint
(TC-OAD-E)
OA spacer
(TC-OAS-E)
150
100
95
50
0
0.0 0.5
Lid
354
- -
'17 • SCM-T-225
530
(Suspension bolts pitch)
Control
223 190
box
185
Ø75
Hanger plate
for suspension
bolt
One set of duct joint Two sets of duct joints
1.3
1.0 1.5 2.0 2.5
Introduced outdoor air volume [m /min]
3
Spacer
When installing the duct
joint at the lid side, remove
Duct joint the lid and reinstall it at the
other end before installing
the duct joint.
Screw
114
2.6
3.0